Page 295 - ICSE Math 7

SHORT ANSWER TYPE QUESTIONS

1. Find the value of the following.
(a) (–5) × (–20) × 11 × (–4) (b) –17 + 51 + (–13) + 11

2. Which is greater: |–11| + 23 – 3 or –5 + 28 + |–9|?
9 45 b
3. Find a and b so that = = .
13 a 91
4. Express 32 cm as a fraction of 5 m 12 cm.
5. Find the quotient when 35.42 is divided by 2.3.
6. Round off 12.078 correct to three significant figures.
25 15 2
7. Find the value of ÷ × .
16 8 7
7
8. Express as a rational number with numerator 56.
8
2 3
3 4
9. Express (5 ) × {5 ÷ (5 ) } as a positive power of a number.
10. Express 2,401 × 128 as a product of power of prime numbers.
11. Write the following sets in roster form.
(a) Set of all natural numbers which divide 16.

(b) Set of all letters in the word SUCCESSOR.
2
12. Let A = {x | x ≤ 9, x ∈ Z} and B = {–1, 0 1, 2}, find:
(a) A ∪ B (b) B ∩ A
3 1
13. Express 1 :1 in their simplest form.
5 7
3 1
14. Find x such that 2 :1 = 7 : x .
5 5
15. What per cent of ` 1,200 is equal to 7% of ` 840?
16. In an exam, Kanika scored 280 marks. Her percentage was 70%. Find the total marks.

2
17. The cost price of a refrigerator is ` 75,000 and its selling price is of its cost price. Find its
profit or loss. 3
18. The listed price of a trouser is ` 1,800. Under a festival offer, it is sold at ` 1,575. Find its
discount per cent.
19. In how much time will the interest on a sum of money will be one-fifth of the money at 10%
per annum?
20. Find the sum that will given ` 100 as interest at the rate of 5% per annum for 5 April to 17 June
of the same year.
21. A car travels 248 km in 4 hours. How long will it take to travel 434 km?
–1
–1
22. Which is greater—a speed of 108 km h or a speed of 39 m s ?
2 5
3 2
23. For the polynomial, 7m n – 4m n + 3mn – 15, answer the following questions.
(a) Write all the terms of the given polynomial.
2
3 2
2 5
2
(b) Write the coefficient of m in –4m n and n in 7m n .
(c) What is the degree of the given polynomial?
281